It's the Earth-orbiting research lab as big as a five-bedroom house, complete with two bathrooms, a gym and a huge bay window — but how much do we know about what goes on at the International Space Station?

After the Kooyman family lost a 41-day-old son to a rare genetic disorder, they didn't think they go through having a child again. But genetic screening — and the generosity of a doctor — has helped them have a set of healthy twins.